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A New Chrysochlorid from Makapansgat

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A New Chrysochlorid from Makapansgat CORE Metadata, citation and similar papers at core.ac.uk Provided by Wits Institutional Repository on DSPACE A NEW CHRYSOCHLORID FROM MAKAPANSGAT By G. DE GRAAFF ABSTRACf In this paper a new species of golden m:ole Chrysotricha hamiltoni sp. nov. from Limeworks, Makapansgat, is described. This is the first occurrence of a fossil golden mole at this site; two fossil forms (Proamblysomus antiquus Broom and Chlorotalpa spelea Broom) have previously been recorded from Sterkfontein. INTRODUCfION During a visit to the fossil-yielding dumps at Limeworks in the Makapansgat valley near Potgietersrus in the Central Transvaal in April 1957, Mr. J. W. Kitching of the Bernard Price Institute for Palaeontological Research discovered a small skull embedded in a piece of yellowish grey breccia. The exposed portion was the dorsal part of a cranium from which the parietals had been flaked off leaving a well preserved endocranial cast in position within the remainder of the skull. On development the specimen proved to be the virtually complete skull of a new species of golden mole. Hitherto only two genera have been found as fossils in the dolomite caves of the Transvaal. These were both discovered in the Sterkfontein valley near Krugersdorp. These two fossil types, Proamblysomus antiquus Broom, from the locality known as Bolts Farm, and Chlorotalpa spelea Broom from the Plesianthropus cave at the Sterkfontein site were identified and described by Broom (1941). A third golden mole fossil skull has been found at Kromdraai: it possibly belongs to the species Proamblysomus antiquus but its identity is uncertain owing to the damaged condition of the palate and the teeth. (Broom 1948). The specimen to be described here ranks in size with Proamblysomus antiquus but diverges in its morphology. It is the first fossil golden mole to be recorded from Makapansgat and in consequence of that fact it is proposed to name it after the original owner of the farm, who first permitted the Historical Monuments Commission to declare the Cave of Hearths site a national monument and thus inadvertently set in train the series of discoveries made upon this farm since 1936. The exact horizon from which the specimen originally hailed cannot be determined accurately because the breccia was found amongst the sorted material from the dumps. Judging from its appearance the breccia was probably from the top Australopithecus.bearing layer near the dolomitic roof. No other skeletal remains were closely associated with the specimen so that it had not formed part of an owl pellet. These fossilized owl pellets display a characteristic conglomeration of small partially digested bones, jaws and teeth chiefly of rodents. It may therefore be looked upon as an article of australopithecine 21 diet concerning which the late Dr. Robert Broom (1946) said: "To have obtained the giant rodent moles (Gypsorhychus) he (Australopithecus) must have been able to dig with either sticks or stones: and it is unlikely that he could have captured a spring hare (Pedetes) except by digging." Alternatively, one may say in the case of the capture of the golden mole that this specimen could have been dug up by Australopithecus with either horns or bones. PREPARATION Despite its fragility and small size the specimen was developed manually with a small hammer and chisel. After the main bulk of breccia had been removed the specimen was subjected to the acetic acid technique. The individual bones in the skull cannot be demarcated with certainty. This is partially due to the fact that it appears to be an adult specimen in which the cranial bones are anchylosed and during the processing the skull acquired a number of layers of glyptal cement to protect the specimen against the corrosive action of the acid. When removing the excess cement with a suitable thinner the glyptal was dissolved but tended simultaneously to remove the thin and fragile bones. As the glyptal holds together the fragile material it was decided rather to preserve the specimen with the protective layers of glyptal surrounding the bones than to risk further damage. Chrysotricha hamiltoni sp. nov. The original owner of the Makapansgat farm was the late Mr. J. M. Hamilton and the estate on which the remarkable palaeontological discoveries were made that have made this site known internationally is today the property of his daughter Mrs. M. J. Bonamour of Durban. As amongst the various numerous fossils from this site none have hitherto commemorated the ancestral owner's name it has been decided to name this particular specimen Chrysotricha hamiltoni sp. nov. It is housed in the fossil mammal collection of the Bernard Price Institute, Catalogue Number MP. 1. The skull is virtually complete except for some slight damage to the anterior part of the snout and the region inside the orbit. The principal dimensions upon which the identification is based are given in table I. A brief description of the dorsal, ventral, occipital and lateral aspects of the skull will indicate the amount of damage suffered by it during the process of fossilization. a. Norma dorsalis. The anterior portions of the nasals and premaxillaries with their characteristic projections for the attachment of nose pads in the living animal are not present. The posterior parts of the nasals are complete and the junction of the nasals with the frontals is clear in the form of a small but distinctly raised ridge. The nasal-maxilla suture is not clear. The right frontal is undamaged while the left frontal has been flaked off latero-posteriorly. The large parietals have, as stated, been flaked off entirely, exposing the well preserved endocranial cast. 22 The delicate zygoma have nevertheless survived the rigours of fossilization and it has been possible to keep the arches intact while removing the breccia surrounding them. The posterior zygoma forms a slightly broader plate at the point of fusion with the undamaged squamosal elements. There is no trace of a jugal bone in the .arch and the arches are formed by a backward process of the maxilla. b. Norma -ventralis. The maxillaries are well preserved. The premaxillaries are intact on the palatal aspect, containing the large incisor sockets of the first large incisors. The anterior palatine foramina are visible as two small breccia·filled cavities. The maxillanes furthermore form the greater part of the palate. The posterior portion of the right maxilla has been damaged slightly but that of the left side has been preserved. The intact sockets thus afford information about the number of teeth. There were nine in each tooth row. 5 6 Figures 5 and 6-Do rsal and ventral views of the skull of Chrysotl'icha hamiltolli sp. nov. The boundary between the palatines and the maxillaries is not distinct. The palatine bones are preserved, being strengthened above by the breccia filling the internal choanae. Consequently the vomer cannot be seen clearly. The pterygoidal elements are present, though without their characteristic pterygoidal processes. The base of the cranium (the basisphenoid and the basioccipital) is undamaged. 23 The area covered by these bones is relatively small. The tympanic bullae are well preserved and rather large, the right bulla being slightly damaged in the petrosal area. The passage leading to the external auditory meatus is visible from the outside in the shape of a small raised ridge. The norma dorsalis and norma ventralis are shown in figures 5 and 6 respectively. c. Norma occipitalis. The dorsal part of the supra-occipital has flaked off with the parietals. On the lateral side of the supraoccipitals there is a rounded area of bone of moderate size which Broom regards as the tabular. (Broom 1916). This area is somewhat flaked on the right side. The occipital condyles are well formed and strong while the associated exoccipitals are undamaged. The foramen magnum is a well-defined aperture rather arched dorsally. d. Norma lateralis. The condition of the zygomatic arches has already been described. The lachrymal is small and cannot be made out in this skull. The infraorbital foramen, damaged on the left side, is large, while the deep parts of the orbits are somewhat damaged and distorted so that the alisphenoid and orbitosphenoid bones and the associated foramina cannot be distinguished with certainty. The bullae do , not extend farther down ventrally than the occipital condyles. DISCUSSION Simpson (1945) has placed the Chrysochloroidea together with the T enrecoidea as a fairly well defined group among the recent Insectivora. In addition, he remarks: " . Broom especially has shown that the Chrysochloroids are basically different from the other 'zalambdodonts'. (i.e. T enrecoidea). He removed them from the Insectivora and made a new Order for them. This seems too radical, but the structural difference is so great that it cannot be affirmed that the Chrysoch­ loroids are phyletically closer to the tenrecoids than to the other insectivores, although the two share the common anatomical feature of being zalambdodont, that is, having a singl~ outer V on the upper molars instead of two." Roberts (1951) has followed Broom's concept and has placed the golden moles of South Africa in a separate Order. This paper is not intended to discuss the intricate taxonomic posltion of these animals and the classification presented by Roberts in "The Mammals of South Africa" has been followed for this fossil specimen. Roberts has subdivided the Chrysochloridae into nine genera. The specimen under review here does not belong to the genera Chrysospalax
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